user
Write a response that appropriately completes the request.

### Instruction:
Tell me what a search engine is

### Response:
assistant
A search engine is a type of software that finds webpages, documents and other online content based on a query. It is a powerful tool that allows users to quickly find information they need on the internet. Search engines use complex algorithms to crawl the web and build an index of the content they find. Search queries are then processed against the index to retrieve the best matches for the user's needs.